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(5x+1)/6-[(3x-1)/4-(3x+1)/3] =2(5x+1)/12-[3(3x-1)/12-4(3x+1)/12] =(10x+2)/12-(9x-3)/12+(12x-4)/12 =(13x+1)/12 =[13*(-9)+1]/12 =(-116)/12 =-29/3
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